Derivative Instruments and Hedging Activities - Outstanding Foreign Currency Forward Contracts that Were Entered into to Hedge Balance Sheet Exposures (Detail) - Not Designated as Hedging Instrument - Foreign Exchange Forward $ in Millions	Sep. 30, 2016 USD ($)
Notional Value Sold
Derivative [Line Items]
Notional Value	$ 270.4
Notional Value Sold | Australian Dollar
Derivative [Line Items]
Notional Value	21.2
Notional Value Sold | Brazilian Real
Derivative [Line Items]
Notional Value	7.1
Notional Value Sold | Canadian Dollar
Derivative [Line Items]
Notional Value	0.0
Notional Value Sold | Euro
Derivative [Line Items]
Notional Value	159.2
Notional Value Sold | Indian Rupee
Derivative [Line Items]
Notional Value	9.1
Notional Value Sold | Japanese yen
Derivative [Line Items]
Notional Value	69.3
Notional Value Sold | Swedish Krona
Derivative [Line Items]
Notional Value	4.5
Notional Value Sold | Swiss Franc
Derivative [Line Items]
Notional Value	0.0
Notional Value Purchased
Derivative [Line Items]
Notional Value	98.0
Notional Value Purchased | Australian Dollar
Derivative [Line Items]
Notional Value	0.0
Notional Value Purchased | Brazilian Real
Derivative [Line Items]
Notional Value	0.0
Notional Value Purchased | Canadian Dollar
Derivative [Line Items]
Notional Value	3.0
Notional Value Purchased | Euro
Derivative [Line Items]
Notional Value	1.0
Notional Value Purchased | Indian Rupee
Derivative [Line Items]
Notional Value	0.0
Notional Value Purchased | Japanese yen
Derivative [Line Items]
Notional Value	0.0
Notional Value Purchased | Swedish Krona
Derivative [Line Items]
Notional Value	0.0
Notional Value Purchased | Swiss Franc
Derivative [Line Items]
Notional Value	$ 94.0